{"UUID":"6458176d-393c-458f-a424-229bf5ba37a3","URL":"http://techblog.appnexus.com/2013/2013-09-17-outage-postmortem/","StartTime":"0001-01-01T00:00:00Z","EndTime":"0001-01-01T00:00:00Z","Categories":["postmortem"],"Company":"AppNexus","Product":"","Description":"A double free revealed by a database update caused all \"impression bus\" servers to crash simultaneously. This wasn't caught in staging and made it into production because a time delay is required to trigger the bug, and the staging period didn't have a built-in delay."}